Not all of this is applicable to paying the bills for other online communities, but here's a couple things we've tried on Improbable Island.
1. Adverts! We used to have banner ads across the top of the site. If I earned a buck a day with a banner ad, that was a good day. It's not 1999 anymore, adverts don't earn money unless you're doing the creepy spyware stuff that right from the start I knew I never wanted to do.
2. Optional adverts! If you paid a fiver you could get rid of them.
